阅读说明：本技术 一种铝合金的冷轧方法 (Cold rolling method of aluminum alloy ) 是由 陆伟良 张国良 于 2021-08-23 设计创作，主要内容包括：本发明涉及铝合金材料冷轧技术领域,具体涉及一种铝合金的冷轧方法。该方法包括将铝合金粗轧坯料以400-800mm/min的速度进行冷轧,所述冷轧过程中使用轧制润滑油,所述轧制润滑油的羟值为21-26mgKOH/g,皂化值为22-25mgKOH/g,油粘度为3-3.6mm～(2)/s,酸值＜2mgKOH/g；在冷轧过程中使用的轧辊粗糙度为0.3-0.5μm,轧辊换辊周期为1-2天,支撑辊换辊周期为15-30天。本发明通过调整冷轧工艺的各项参数来实现大压下量以提升道次加工率的目的,在实际生产过程中增加产能的同时也减少了企业的生产成本,降低了能耗,最终提升了生产效率。(The invention relates to the technical field of aluminum alloy material cold rolling, in particular to a cold rolling method of an aluminum alloy. The method comprises the step of cold rolling the aluminum alloy rough rolling blank at the speed of 400-800mm/min, wherein rolling lubricating oil is used in the cold rolling process, the hydroxyl value of the rolling lubricating oil is 21-26mgKOH/g, the saponification value is 22-25mgKOH/g, and the oil viscosity is 3-3.6mm 2 (ii)/s, acid value < 2 mgKOH/g; the roughness of the roller used in the cold rolling process is 0.3-0.5 μm, the roller changing period of the roller is 1-2 days, and the roller changing period of the supporting roller is 15-30 days. The invention realizes the purpose of increasing the pass processing rate by adjusting various parameters of the cold rolling process through large reduction, increases the productivity in the actual production process, reduces the production cost of enterprises, reduces the energy consumption and finally improves the production efficiency.)

1. The cold rolling method of the aluminum alloy is characterized by comprising the step of carrying out cold rolling on an aluminum alloy rough rolling blank at the speed of 400-800mm/min, wherein a rolling lubricating oil is used in the cold rolling process, the hydroxyl value of the rolling lubricating oil is 21-26mgKOH/g, the saponification value is 22-25mgKOH/g, and the oil viscosity is 3-3.6mm²(ii)/s, acid value < 2 mgKOH/g;

wherein, the roughness of the roller used in the cold rolling process is 0.3-0.5 μm, the roller changing period of the roller is 1-2 days, and the roller changing period of the supporting roller is 15-30 days.

2. The method of claim 1, wherein the aluminum alloy is 3102 aluminum alloy.

3. The method as claimed in claim 1, wherein the method for preparing the aluminum alloy rough mill billet comprises the steps of smelting raw materials containing corresponding chemical compositions, refining, slagging off, online degassing, filtering and continuous casting and rolling.

4. A method according to claim 1 or 3, characterized in that the aluminium alloy bloom is cooled to ≤ 40 ℃ and then cold rolled.

5. The method according to claim 1, characterized in that the inlet strip thickness at cold rolling is 6-10 mm.

6. Method according to claim 1, characterized in that compressed air is used for purging during cold rolling.

7. The method of claim 6, wherein the compressed air has a pressure of 0.2 to 0.6 MPa.

8. The method as claimed in claim 1, wherein the rolling lubricant has a light transmittance of 79% or more, a moisture content of less than 200ppm, a temperature of 34-44 ℃ and a distillate yield of 90% or more.

9. The method as claimed in claim 1, wherein the roughness of the support roll is 0.75-0.95 μm, the ovality is 0.01mm or less, the diameter difference between both ends is 0.01mm or less, and the diameter difference between the mating rolls is 0.1mm or less.

10. The method of claim 1, wherein the ovality of the roll is 0.01mm or less, the diameter difference between the two ends is 0.01mm or less, and the diameter difference between the mating rolls is 0.05mm or less.

Technical Field

The invention relates to the technical field of aluminum alloy material cold rolling, in particular to a cold rolling method of an aluminum alloy.

Background

In the aluminum alloy material processing industry, two common rolling production modes include cold rolling and hot rolling, wherein the cold rolling refers to a production mode below the recrystallization temperature, and because the cold rolling temperature is low, dynamic recrystallization can not occur in the rolling process, the product temperature can only be raised to the recovery temperature, and the work hardening rate is high. The cold rolling has the advantages that: the plate and the strip have high dimensional accuracy and good surface quality; the structure and the performance of the plate and the strip are more uniform; products in different states can be obtained by matching with heat treatment; it is possible to roll a thin strip which is not possible to be rolled out by hot rolling. However, cold rolling has the disadvantages that: the deformation energy consumption is large, and the pass machining rate is small. The annual capacity of cold rolling of the aluminum alloy is 17600 tons, and the capacity is lower.

How to reduce the energy consumption in the cold rolling process and reduce the production cost, especially the problem that the improvement of the pass processing rate is needed to be solved in the cold rolling process, and the improvement of the rolling process becomes the key of a factory in the actual production process.

The method has the advantages that the determination of the total reduction rate of the intermediate cold rolling is different according to different cold rolling purposes, the limitations of metal plasticity, equipment conditions, the minimum rollable thickness, product technical requirements and the like are mainly considered, the alloy plasticity is fully exerted, the large total reduction rate is adopted as far as possible, and the cost is reduced.

Disclosure of Invention

The invention aims to solve the problem of low pass working rate of aluminum alloy cold rolling in the prior art, and provides a cold rolling method of an aluminum alloy, which achieves the purpose of improving the working rate by adjusting various parameters of a cold rolling process.

In order to achieve the above object, the present invention provides a cold rolling method of an aluminum alloy, which comprises cold rolling a rough rolled aluminum alloy blank at a speed of 400-800mm/min using a rolling lubricant having a hydroxyl value of 21-26mgKOH/g, a saponification value of 22-25mgKOH/g, and an oil viscosity of 3-3.6mm²(ii)/s, acid value < 2 mgKOH/g;

wherein, the roughness of the roller used in the cold rolling process is 0.3-0.5 μm, the roller changing period of the roller is 1-2 days, and the roller changing period of the supporting roller is 15-30 days.

Preferably, the aluminum alloy is 3102 aluminum alloy.

Preferably, the preparation method of the aluminum alloy rough rolling blank comprises the steps of smelting raw materials containing corresponding chemical components, refining, slagging off, online degassing, filtering and continuous casting and rolling.

Preferably, the aluminum alloy rough rolling blank is cooled to be less than or equal to 40 ℃ and then is subjected to cold rolling.

Preferably, the thickness of the inlet strip during the cold rolling is 6-10 mm.

Preferably, the purging is performed using compressed air during the cold rolling.

Preferably, the pressure of the compressed air is 0.2-0.6 MPa.

Preferably, the light transmittance of the rolling lubricating oil is more than or equal to 79 percent, the water content is less than 200ppm, the temperature is 34-44 ℃, and the distillation rate is more than or equal to 90 percent.

Preferably, the roughness of the supporting roller is 0.75-0.95 μm, the ovality is less than or equal to 0.01mm, the diameter difference of two ends is less than or equal to 0.01mm, and the diameter difference of a mating roller is less than or equal to 0.1 mm.

Preferably, the ovality of the roller is less than or equal to 0.01mm, the diameter difference of two ends is less than or equal to 0.01mm, and the diameter difference of a matched roller is less than or equal to 0.05 mm.

The method improves the pass processing rate by adjusting various parameters of the cold rolling process, increases the productivity in the actual production process, reduces the production cost of enterprises, reduces the energy consumption and finally improves the production efficiency.

Detailed Description

The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

The invention provides a cold rolling method of an aluminum alloy, which comprises the step of carrying out cold rolling on an aluminum alloy rough rolling blank at the speed of 400-800mm/min, wherein rolling lubricating oil is used in the cold rolling process, the hydroxyl value of the rolling lubricating oil is 21-26mgKOH/g, the saponification value is 22-25mgKOH/g, and the oil viscosity is 3-3.6mm²(ii)/s, acid value < 2 mgKOH/g;

wherein, the roughness of the roller used in the cold rolling process is 0.3-0.5 μm, the roller changing period of the roller is 1-2 days, and the roller changing period of the supporting roller is 15-30 days.

In the present invention, the aluminum alloy is 3102 aluminum alloy.

In the invention, the preparation method of the aluminum alloy rough rolling blank comprises the steps of smelting raw materials containing corresponding chemical components, refining, slagging off, online degassing, filtering and continuous casting and rolling.

Preferably, the aluminum alloy rough rolling blank is cooled to be less than or equal to 40 ℃ and then is subjected to cold rolling.

In the invention, the thickness of the inlet strip in the cold rolling is 6-10 mm.

In the present invention, the aluminum alloy rough rolled blank is purged with compressed air during cold rolling, preferably, the pressure of the compressed air is 0.2 to 0.6 MPa.

In the present invention, the pressure is an absolute pressure.

Under the optimal condition, the light transmittance of the rolling lubricating oil is more than or equal to 79 percent, the water content is less than 200ppm, the temperature is 34-44 ℃, and the distillation rate is more than or equal to 90 percent.

In the invention, the convexity of the upper roll of the roller is 0.04mm, the convexity of the lower roll is 0.04mm, and the surface of the roller is not required to have grinding lines, vibration marks, scratches and marks. Allowing the use of helical lines and twills without affecting the use.

In the invention, the convexity of the upper roll of the supporting roll is 0mm, and the convexity of the lower roll is 0 mm.

Preferably, the roughness of the supporting roller is 0.75-0.95 μm, the ovality is less than or equal to 0.01mm, the diameter difference of two ends is less than or equal to 0.01mm, and the diameter difference of a mating roller is less than or equal to 0.1 mm.

Preferably, the ovality of the roller is less than or equal to 0.01mm, the diameter difference of two ends is less than or equal to 0.01mm, and the diameter difference of a matched roller is less than or equal to 0.05 mm.

The invention realizes the purpose of increasing the pass processing rate by large reduction by adjusting various parameters (hydroxyl value, saponification value, oil viscosity, roller roughness, roller changing period of a supporting roller and the like) of the cold rolling process, reduces the production cost of enterprises while increasing the productivity in the actual production process, reduces the energy consumption and finally improves the production efficiency.

The present invention will be described in detail below by way of examples, but the scope of the present invention is not limited thereto.

The preparation methods of the aluminum alloy rough rolling blanks used in the following examples and comparative examples are all smelting, refining, slagging off, online degassing, filtering and continuous casting and rolling of raw materials containing corresponding chemical components; the convexity of the upper roll of the used roll is 0.04mm, the convexity of the lower roll is 0.04mm, the convexity of the upper roll of the used support roll is 0mm, and the convexity of the lower roll is 0 mm.

Example 1

Cooling 3102 aluminum alloy rough rolling blank to 40 deg.C, cold rolling at 600mm/min to obtain 7mm thick strip, and using rolling lubricant with hydroxyl value of 24mgKOH/g, saponification value of 24mgKOH/g, and oil viscosity of 3.4mm²The aluminum alloy rough rolling blank is blown by compressed air in the cold rolling process, the pressure of the compressed air is 0.3MPa, the roughness of a roller used in the cold rolling process is 0.3 mu m, the ovality is 0.01mm, the diameter difference of two ends is 0.005mm, the diameter difference of a matched roller is 0.04mm, the roughness of a supporting roller used is 0.8 mu m, the ovality is 0.01mm, the diameter difference of two ends is 0.005mm, the diameter difference of the matched roller is 0.05mm, the roller changing period of the supporting roller is 2 days, the roller changing period of the supporting roller is 30 days, and a cold-rolled aluminum alloy roll A1 is obtained.

In the embodiment, the cold rolling passes are 2 passes, the working rate of the first pass is 70%, the working rate of the second pass is 64.29%, the thickness of the obtained aluminum coil is 0.75mm, the processing efficiency is 30 minutes/coil, the productivity is 44 coils/day, 1320 coils/month and the annual productivity is 26400 tons.

Example 2

Cooling 3102 aluminum alloy rough rolling blank to 38 deg.C, cold rolling at 400mm/min to obtain 6mm thick strip, and using rolling lubricant with hydroxyl value of 25mgKOH/g, saponification value of 22mgKOH/g, and oil viscosity of 3.6mm²(s), the light transmittance is 82%, the acid value is 1.6mgKOH/g, the water content is 180ppm, the temperature is 44 ℃, the distillation rate is 92%, compressed air is used for blowing the aluminum alloy rough rolling blank in the cold rolling process, the pressure of the compressed air is 0.6MPa, the roughness of a roller used in the cold rolling process is 0.43 mu m, and the ovality is 0.01mm, the diameter difference of two ends is 0.01mm, the diameter difference of a mating roll is 0.05mm, the roughness of a used supporting roll is 0.85 mu m, the ovality is 0.005mm, the diameter difference of two ends is 0.01mm, the diameter difference of the mating roll is 0.1mm, the roll changing period of the roller is 1.5 days, and the roll changing period of the supporting roll is 15 days, so that the aluminum alloy coil A2 after cold rolling is obtained.

In the embodiment, the cold rolling passes are 2 passes, the working rate of the first pass is 65%, the working rate of the second pass is 64.3%, the thickness of the obtained aluminum coil is 0.75mm, the processing efficiency is 29 minutes/coil, the productivity is 45 coils/day, and 1350 coils/month.

Example 3

Cooling 3102 aluminum alloy rough rolling blank to 35 deg.C, cold rolling at 700mm/min to obtain 8mm thick strip, and using rolling lubricant with hydroxyl value of 21mgKOH/g, saponification value of 23mgKOH/g, and oil viscosity of 3mm²And/s, the light transmittance is 85%, the acid value is 1mgKOH/g, the water content is 140ppm, the temperature is 40 ℃, the distillation rate is 93%, compressed air is used for blowing the aluminum alloy rough rolling blank in the cold rolling process, the pressure of the compressed air is 0.2MPa, the roughness of a roller used in the cold rolling process is 0.5 mu m, the ovality is 0.006mm, the diameter difference of two ends is 0.004mm, the diameter difference of a paired roller is 0.02mm, the roughness of a supporting roller used is 0.75 mu m, the ovality is 0.007mm, the diameter difference of two ends is 0.01mm, the diameter difference of the paired roller is 0.1mm, the roller changing period is 1 day, and the roller changing period of the supporting roller is 30 days, so that the aluminum alloy roll A3 after cold rolling is obtained.

In the embodiment, the cold rolling passes are 2 passes, the working rate of the first pass is 70%, the working rate of the second pass is 68.75%, the thickness of the obtained aluminum coil is 0.75mm, the processing efficiency is 33 minutes/coil, the productivity is 43 coils/day, and 1290 coils/month.

Example 4

Cooling 3102 aluminum alloy rough rolling blank to 30 deg.C, cold rolling at 800mm/min with an inlet strip thickness of 10mm, using rolling lubricant oil with a hydroxyl value of 26mgKOH/g, a saponification value of 25mgKOH/g, and an oil viscosity of 3.5mm²(s) transmittance of 84%, acid value of 1.7mgKOH/g, water content of 100ppm, temperature of 40 ℃, and distillate yield91 percent, blowing the aluminum alloy rough rolling blank by using compressed air in the cold rolling process, wherein the pressure of the compressed air is 0.5MPa, the roughness of a roller used in the cold rolling process is 0.48 mu m, the ovality is 0.004mm, the diameter difference of two ends is 0.01mm, the diameter difference of a matched roller is 0.03mm, the roughness of a used supporting roller is 0.95 mu m, the ovality is 0.01mm, the diameter difference of two ends is 0.007mm, the diameter difference of the matched roller is 0.1mm, the roller changing period of the roller is 1.5 days, and the roller changing period of the supporting roller is 25 days, so that the cold-rolled aluminum alloy A4 is obtained.

In the embodiment, the cold rolling passes are 2 passes, the working rate of the first pass is 75%, the working rate of the second pass is 70%, the thickness of the obtained aluminum coil is 0.75mm, the working efficiency is 35 minutes/coil, the productivity is 39 coils/day, and the coils are 1170 coils/month.

Example 5

Cooling 3102 aluminum alloy rough rolling blank to 25 deg.C, cold rolling at 550mm/min to obtain 9mm thick strip, and using rolling lubricant with hydroxyl value of 23mgKOH/g, saponification value of 24mgKOH/g, and oil viscosity of 3.3mm²The aluminum alloy rough rolling blank is blown by compressed air in the cold rolling process, the pressure of the compressed air is 0.4MPa, the roughness of a roller used in the cold rolling process is 0.35 mu m, the ovality is 0.01mm, the diameter difference of two ends is 0.004mm, the diameter difference of a matched roller is 0.05mm, the roughness of a supporting roller used is 0.8 mu m, the ovality is 0.005mm, the diameter difference of two ends is 0.01mm, the diameter difference of the matched roller is 0.04mm, the roller changing period of the supporting roller is 2 days, and the roller changing period is 28 days, so that the cold-rolled aluminum alloy roll A5 is obtained.

In the embodiment, the cold rolling passes are 2 passes, the working rate of the first pass is 72%, the working rate of the second pass is 70.24%, the thickness of the obtained aluminum coil is 0.75mm, the processing efficiency is 35 minutes/coil, the productivity is 39 coils/day, and 1170 coils/month.

Comparative example 1

This comparative example was carried out using the same aluminum alloy rough rolled stock as in example 1, by the method described in example 1, except that the rolling stock used wasThe prepared lubricating oil has a hydroxyl value of 11mgKOH/g, a saponification value of 20mgKOH/g, and an oil viscosity of 2.8mm²And/s, the roughness of the roller used in the cold rolling process is 0.55 mu m, the roller changing period of the roller is 3 days, and the roller changing period of the supporting roller is 90 days, so that the cold-rolled aluminum alloy coil D1 is obtained.

In the comparative example, the cold rolling passes were 3 passes, the reduction ratio in the first pass was 55.7%, the reduction ratio in the second pass was 53.2%, and the reduction ratio in the third pass was 48.32%, and the obtained aluminum coil had a thickness of 0.75mm and had a working efficiency of 45 min/coil, 29 coils/day, and 870 coils/month.

Comparative example 2

This comparative example was carried out by the method described in example 1 using the same aluminum alloy rough rolled material as in example 1, except that the rolling lubricant used had a hydroxyl value of 10mgKOH/g, and an aluminum alloy coil D2 after cold rolling was obtained.

In the comparative example, the cold rolling passes are 3 passes, the working ratio of the first pass is 54%, the working ratio of the second pass is 53%, the working ratio of the third pass is 50.44%, the thickness of the obtained aluminum coil is 0.75mm, the working efficiency is 42 minutes/coil, the productivity is 30 coils/day and 900 coils/month.

Comparative example 3

This comparative example was carried out by the method described in example 1 using the same aluminum alloy rough rolled material as in example 1, except that the rolling lubricant used had an oil viscosity of 2mm²And/s, obtaining an aluminum alloy coil D3 after cold rolling.

In the comparative example, the cold rolling passes are 3 passes, the working ratio of the first pass is 55%, the working ratio of the second pass is 52%, the working ratio of the third pass is 50.4%, the thickness of the obtained aluminum coil is 0.75mm, the working efficiency is 45 minutes/coil, the productivity is 29 coils/day, and 870 coils/month.

Comparative example 4

This comparative example was carried out by the method described in example 1 using the same aluminum alloy rough rolled material as in example 1, except that the rolling lubricant used had a saponification value of 12mgKOH/g, and a cold-rolled aluminum alloy coil D4 was obtained.

In the comparative example, the cold rolling passes are 3 passes, the working ratio of the first pass is 56%, the working ratio of the second pass is 51%, the working ratio of the third pass is 50.3%, the thickness of the obtained aluminum coil is 0.75mm, the working efficiency is 42 minutes/coil, the productivity is 31 coils/day, and 930 coils/month.

Comparative example 5

This comparative example was carried out by the method described in example 1 using the same aluminum alloy rough rolled material as in example 1, except that the roughness of the roll used in the cold rolling was 0.6 μm, and an aluminum alloy coil D5 after cold rolling was obtained.

In the comparative example, the cold rolling passes were 3 passes, the reduction ratio of the first pass was 55%, the reduction ratio of the second pass was 53%, the reduction ratio of the third pass was 49.34%, the thickness of the obtained aluminum coil was 0.75mm, the processing efficiency was 41 minutes/coil, the productivity was 31 coils/day, 930 coils/month.

Test example 1

Tensile strength, yield strength and elongation were tested A1-A5 and D1-D5.

The results are shown in Table 1.

TABLE 1

Numbering	Tensile strength/MPa	Yield strength/MPa	Elongation/percent
				A1	345	320	2.3
A2	340	320	2
				A3	338	321	2.1
A4	335	324	1.9
				A5	340	317	1.8
D1	310	298	1.5
				D2	316	300	1.8
D3	320	299	1.8
				D4	322	300	1.7
D5	319	303	1.9

The results in table 1 show that the aluminum alloy coil obtained by cold rolling can meet the use requirements by adopting the method of the present invention, and the method of the present invention can improve the pass processing rate, reduce the rolling passes, improve the production efficiency and increase the productivity.

The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.